/**
 * Session Edge Cases Tests
 *
 * TDD tests for implementing robust session handling.
 * These tests are written BEFORE implementation (RED phase).
 *
 * HIGH Priority Edge Cases:
 * 1. Watch Completion - 85% threshold (configurable per media type)
 * 2. Stale Stream Force-Stop - 5 minute timeout
 * 3. Minimum Play Time Filtering - 120s default
 * 4. Continued Session Threshold - 60s configurable
 */

import { describe, it, expect } from 'vitest';
import {
  checkWatchCompletion,
  shouldGroupWithPreviousSession,
} from '../stateTracker.js';

// ============================================================================
// Watch Completion Detection
// ============================================================================
// Industry standard uses 85% threshold (configurable per media type)
// Current implementation uses hardcoded 80%
describe('Watch Completion Detection', () => {
  describe('85% threshold (industry standard)', () => {
    it('should mark as watched at 85% progress', () => {
      // Default: MOVIE_WATCHED_PERCENT = 85, TV_WATCHED_PERCENT = 85
      // Currently fails because implementation uses 80%
      const progressMs = 85000; // 85%
      const totalMs = 100000;

      const result = checkWatchCompletion(progressMs, totalMs);
      // This should pass at 85% but current implementation requires only 80%
      expect(result).toBe(true);
    });

    it('should NOT mark as watched at 84% progress', () => {
      const progressMs = 84000; // 84%
      const totalMs = 100000;

      const result = checkWatchCompletion(progressMs, totalMs);
      // With 85% threshold, 84% should NOT be watched
      // Current implementation incorrectly marks this as watched (80% threshold)
      expect(result).toBe(false);
    });

    it('should NOT mark as watched at exactly 80% (below threshold)', () => {
      const progressMs = 80000; // 80%
      const totalMs = 100000;

      const result = checkWatchCompletion(progressMs, totalMs);
      // With 85% threshold, 80% is NOT watched
      // Current implementation incorrectly marks this as watched
      expect(result).toBe(false);
    });
  });

  describe('configurable threshold per media type', () => {
    it('should accept custom threshold for movies', () => {
      const progressMs = 90000;
      const totalMs = 100000;
      const customThreshold = 0.90; // 90% for some users

      // checkWatchCompletion should accept optional threshold parameter
      // Currently it doesn't - this test should fail
      const result = checkWatchCompletion(progressMs, totalMs, customThreshold);
      expect(result).toBe(true);

      // 89% should not pass with 90% threshold
      const result2 = checkWatchCompletion(89000, 100000, customThreshold);
      expect(result2).toBe(false);
    });

    it('should accept custom threshold for TV episodes', () => {
      const progressMs = 85000;
      const totalMs = 100000;
      const tvThreshold = 0.85;

      const result = checkWatchCompletion(progressMs, totalMs, tvThreshold);
      expect(result).toBe(true);
    });
  });

  // Marker-based completion (future enhancement)
  describe.skip('marker-based completion', () => {
    it('should mark as watched when reaching credits marker', () => {
      // Plex provides intro/credits markers
      // If credits marker exists and user passes it, mark as watched
      // This requires API integration to get markers
    });
  });
});

// ============================================================================
// Stale Stream Force-Stop
// ============================================================================
// Stop sessions after 5 minutes of no updates
describe('Stale Stream Force-Stop', () => {
  describe('shouldForceStopStaleSession', () => {
    // This function doesn't exist yet - tests will fail
    it('should return true when session has no updates for 5+ minutes', async () => {
      const { shouldForceStopStaleSession } = await import('../stateTracker.js');

      // 5 minutes + 1 second (strictly greater than threshold)
      const moreThanFiveMinutesAgo = new Date(Date.now() - (5 * 60 * 1000 + 1000));
      const result = shouldForceStopStaleSession(moreThanFiveMinutesAgo);

      expect(result).toBe(true);
    });

    it('should return false when session was updated within 5 minutes', async () => {
      const { shouldForceStopStaleSession } = await import('../stateTracker.js');

      const threeMinutesAgo = new Date(Date.now() - 3 * 60 * 1000);
      const result = shouldForceStopStaleSession(threeMinutesAgo);

      expect(result).toBe(false);
    });

    it('should return false when lastSeenAt is exactly 5 minutes ago', async () => {
      const { shouldForceStopStaleSession } = await import('../stateTracker.js');

      // Edge case: exactly at threshold should NOT stop
      const exactlyFiveMinutesAgo = new Date(Date.now() - 5 * 60 * 1000);
      const result = shouldForceStopStaleSession(exactlyFiveMinutesAgo);

      expect(result).toBe(false);
    });

    it('should accept configurable timeout in seconds', async () => {
      const { shouldForceStopStaleSession } = await import('../stateTracker.js');

      // 3 minute custom timeout
      const threeMinuteTimeout = 180;
      const threeMinutesAgo = new Date(Date.now() - 3 * 60 * 1000 - 1);

      const result = shouldForceStopStaleSession(threeMinutesAgo, threeMinuteTimeout);
      expect(result).toBe(true);
    });
  });

  describe('integration with session processing', () => {
    it('should mark force-stopped sessions with forceStopped flag', async () => {
      // The database schema should have a forceStopped boolean field
      // When a session is force-stopped, this flag should be set to true
      // This test verifies the schema has the field
      const { sessions } = await import('../../../db/schema.js');

      expect(sessions).toHaveProperty('forceStopped');
    });
  });
});

// ============================================================================
// Minimum Play Time Filtering
// ============================================================================
// Use LOGGING_IGNORE_INTERVAL = 120 seconds
describe('Minimum Play Time Filtering', () => {
  describe('shouldRecordSession', () => {
    // This function doesn't exist yet - tests will fail
    it('should NOT record session with < 120 seconds play time', async () => {
      const { shouldRecordSession } = await import('../stateTracker.js');

      const durationMs = 119 * 1000; // 119 seconds
      const result = shouldRecordSession(durationMs);

      expect(result).toBe(false);
    });

    it('should record session with >= 120 seconds play time', async () => {
      const { shouldRecordSession } = await import('../stateTracker.js');

      const durationMs = 120 * 1000; // Exactly 120 seconds
      const result = shouldRecordSession(durationMs);

      expect(result).toBe(true);
    });

    it('should accept custom minimum play time', async () => {
      const { shouldRecordSession } = await import('../stateTracker.js');

      // Some users want stricter filtering (e.g., 5 minutes)
      const customMinMs = 5 * 60 * 1000;
      const durationMs = 4 * 60 * 1000; // 4 minutes

      const result = shouldRecordSession(durationMs, customMinMs);
      expect(result).toBe(false);
    });

    it('should always record sessions with 0 minimum configured', async () => {
      const { shouldRecordSession } = await import('../stateTracker.js');

      const durationMs = 1000; // 1 second
      const result = shouldRecordSession(durationMs, 0);

      expect(result).toBe(true);
    });
  });

  describe('media type specific filtering', () => {
    it('should apply different minimums for movies vs episodes', async () => {
      const { shouldRecordSession } = await import('../stateTracker.js');

      // Movies might have higher threshold
      const movieMinMs = 180 * 1000; // 3 minutes for movies
      const episodeMinMs = 120 * 1000; // 2 minutes for episodes

      // 2.5 minute watch
      const durationMs = 150 * 1000;

      const recordMovie = shouldRecordSession(durationMs, movieMinMs);
      const recordEpisode = shouldRecordSession(durationMs, episodeMinMs);

      expect(recordMovie).toBe(false); // Under 3 min threshold
      expect(recordEpisode).toBe(true); // Over 2 min threshold
    });
  });
});

// ============================================================================
// Continued Session Threshold
// ============================================================================
// Use CONTINUED_SESSION_THRESHOLD = 60 seconds
describe('Continued Session Threshold', () => {
  describe('shouldGroupWithPreviousSession with configurable threshold', () => {
    const baseSession = {
      id: 'previous-session-id',
      referenceId: null,
      progressMs: 30 * 60 * 1000, // 30 minutes
      watched: false,
      stoppedAt: new Date(),
    };

    it('should NOT group sessions with > 60 second gap when continued session is close', () => {
      // If new session starts at same progress but previous stopped > 60s ago,
      // it should NOT be grouped (it's a fresh start, not a continue)

      const sixtyOneSecondsAgo = new Date(Date.now() - 61 * 1000);

      // This should return null because it's been too long since previous session
      const result = shouldGroupWithPreviousSession(
        { ...baseSession, stoppedAt: sixtyOneSecondsAgo },
        30 * 60 * 1000 // Same progress
      );

      // With 60s default threshold, should NOT group
      expect(result).toBeNull();
    });

    it('should group sessions within 60 second gap', () => {
      const thirtySecondsAgo = new Date(Date.now() - 30 * 1000);

      const result = shouldGroupWithPreviousSession(
        { ...baseSession, stoppedAt: thirtySecondsAgo },
        30 * 60 * 1000
      );

      expect(result).toBe('previous-session-id');
    });

    it('should accept configurable continued session threshold', () => {
      // Some users want longer window for continued sessions
      const customThresholdMs = 5 * 60 * 1000; // 5 minutes
      const twoMinutesAgo = new Date(Date.now() - 2 * 60 * 1000);

      // Third parameter is optional threshold in ms
      const result = shouldGroupWithPreviousSession(
        { ...baseSession, stoppedAt: twoMinutesAgo },
        30 * 60 * 1000,
        customThresholdMs // Custom threshold
      );

      // Within 5 minute threshold, should group
      expect(result).toBe('previous-session-id');
    });
  });

  describe('24 hour maximum for session grouping', () => {
    it('should NEVER group sessions more than 24 hours apart regardless of threshold', () => {
      const twentyFiveHoursAgo = new Date(Date.now() - 25 * 60 * 60 * 1000);

      const result = shouldGroupWithPreviousSession(
        {
          id: 'old-session',
          referenceId: null,
          progressMs: 30 * 60 * 1000,
          watched: false,
          stoppedAt: twentyFiveHoursAgo,
        },
        30 * 60 * 1000
      );

      expect(result).toBeNull();
    });
  });
});

// ============================================================================
// Integration Test: Full Session Lifecycle with Edge Cases
// ============================================================================
describe('Integration: Full Session Lifecycle', () => {
  it('should handle complete watch session with 85% completion', () => {
    // 2 hour movie, watched 1h42m (85%)
    const totalMs = 2 * 60 * 60 * 1000; // 2 hours
    const progressMs = 1.7 * 60 * 60 * 1000; // 1h42m = 85%

    const watched = checkWatchCompletion(progressMs, totalMs);
    expect(watched).toBe(true);
  });

  it('should handle partial watch below 85% threshold', () => {
    // 2 hour movie, watched 1h36m (80%)
    const totalMs = 2 * 60 * 60 * 1000;
    const progressMs = 1.6 * 60 * 60 * 1000; // 1h36m = 80%

    const watched = checkWatchCompletion(progressMs, totalMs);
    // With 85% threshold, 80% is NOT watched
    expect(watched).toBe(false);
  });
});
